An excellent synospsis in the article below.
Business week article
Just two days after the strike began, Lund fired off a "safety recommendation for accident prevention" letter to his supervisors and to FAA headquarters in Washington. It was the loudest alarm he had the authority to ring. Claiming that "a situation exists that jeopardizes life," Lund proposed cutting back on Northwest's flight schedule until mechanics and inspectors could do their job "without error." But instead of taking harsh action against the airline, the agency punished him. On Aug. 29, Lund's supervisors confiscated the badge that gave him access to Northwest's facilities and gave him a desk job. That happened to be the same day the airline sent a letter to the FAA complaining about Lund's allegedly disruptive and unprofessional conduct. The FAA says it treated Lund fairly.
Business week article